JPS61146329A - Mixing device - Google Patents

Abstract

PURPOSE:To realize mixing of multiple components such as petroleum fractions, etc., with good precision and specified proportion by providing a pressure regulating valve to a referential line and reducing the flow rate by reducing a set pressure of the referential line when the degree of opening of a flow control valve provided to a follow-up line attains above a specified value. CONSTITUTION:When the amt. to be used from the pipes 15, 16 for the outside of the system is little (for this case, the primary side pressures of the A component line and the B component line are sufficiently high), or when the number of delivery port 9 during use is small, the pressure in a header pipe 7 is held easily at a standard pressure, for example at 2kg/cm<2>.G. Thus, the proportion of the flow rate of the component B to the flow rate of the component A is held at a desired value, so the delivery work is performed normally. Even if the primary side pressure of the A component line or the B component line is higher than the pressure of this condition, the number of the delivery port during use becomes less, the header pressure is held at a specified level, so the delivery work is performed normally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mixing device for mixing multi-component liquids such as petroleum fractions in a predetermined ratio.

(Prior Art) Conventionally, various types of mixing devices are known for mixing two or more liquid components.
Mask line following method (for example, January 31, 1980 Published by Nichiden Shoin [Latest Control System Series Volume 1 Instrumentation Control System]
(see pages 436-437).

(Problem to be Solved by the Invention) However, if the pressure on the primary side of the component line fluctuates greatly, or if there are many shipping ports for products and the number of ports used varies, the secondary side of the mixed flow line or component line When the pressure fluctuates greatly, the above-mentioned mask line following method has a problem in that the mixing accuracy deteriorates. The reason for this is that if the primary pressure or secondary pressure of the multi-component line changes significantly and the valve opening of the flow control valve in the follow-up line reaches 100%, it will not be possible to follow the reference line. .

(Means for Solving the Problems) The present inventors not only made the flow rate of the follow-up line follow the flow rate of the reference line, but also provided a pressure regulating valve in the reference line; By adopting a method that reduces the flow rate by lowering the set pressure of the reference line when the valve opening of the component line reaches a predetermined value or more, even if the primary pressure or secondary pressure of the component line fluctuates greatly, The present invention was completed by discovering that components can be mixed in a predetermined ratio with high precision.

That is, the mixing device according to the present invention is a mixing device for mixing two or more liquid components, and includes a reference line, which is one line among multi-component lines and is equipped with a flow meter and a pressure regulating valve, and a reference line that is provided with a flowmeter and a pressure regulating valve, and a mixing device that mixes two or more liquid components. A follow-up line that is equipped with a flowmeter and a flow rate control valve, a ratio setting controller that adjusts the flow rate of the follow-up line according to the flow rate of the reference line, and a ratio setting controller that controls the pressure control valve of the reference line to maintain the reference line. and the following line when the signal issued from the ratio setting controller to the flow control valve in the mixed flow line reaches an amount corresponding to the valve opening of a predetermined value or more. and a pressure adjustment needle that controls the reference line pressure adjustment valve by lowering the set pressure of the reference line.

An example of a mixing device according to the present invention will be explained with reference to FIG.

The figure shows a mixing device for mixing component A and component B. The line (flow path) for component A is the reference line, and the pipe 1 has a flow meter 2 on the upstream side and a pressure regulating valve 3 on the downstream side. It is provided. The component B line is a follow-up line, and its pipe 4 is provided with a flow meter 5 on the upstream side and a flow rate control valve 6 on the downstream side. Either pipe 1 or pipe 4 may be used as the reference line, but usually the reference line is the one with less pressure fluctuation or the one with higher flow rate (the figure shows an example of two components A and B, but three components Even if there are multiple components listed above, one of them
The line can be used as a reference line and the other lines can be used as follow-up lines in the same way as the line of component B in the figure. ,
). Component A flowing through the tube 1 and component B flowing through the tube 4 flow into the Hesogo tube 7 and are blended in the tube to form a mixed stream.

The mixed flow flows to a pipe 8 connected to the hesogoo pipe 7, and the pipe 8 has several (for example, 2 to 20) product shipping ports 9 (all of these product shipping ports are the same, so only two are shown in the figure). show,
Other shipping ports are omitted. ) are connected. Each shipping port 9 branches from the pipe 8, and the branch pipe 10
is provided with a flow meter 11, a constant flow valve 12, and an on-off valve 13, and a shipping nozzle 14 is connected to the tip thereof. The constant flow valve 12 allows the mixed flow to flow from the shipping nozzle 14 at a constant flow rate, and the on-off valve 13 gradually increases the flow rate when the mixed flow starts flowing from the shipping nozzle 14 in order to avoid disasters caused by static electricity. When the flow ends, gradually reduce the flow rate. In order to use components A and B in systems separate from the present mixing device, tubes 15 and 16 are respectively connected to tubes 1.
4 and is connected to the upstream side of the flowmeter 2.5. If necessary, install a stop valve (a limit switch, etc. to confirm opening/closing may be equipped with a limit switch, etc. to confirm opening/closing) at an appropriate position in the pipeline of the above-mentioned mixing device, etc., in case of an emergency. Of course, it is possible. Flow meter 2.5 above
．． 11 is preferably a positive displacement flowmeter such as an oval flowmeter or a Roots flowmeter, but other types of flowmeters can also be used.

Depending on the amount of flow from pipe 15.16 to the outside of the system, pipe 1.4
The flow rate of the multi-component line fluctuates, and the pressure on the secondary side of the multi-component line fluctuates depending on the number of shipping ports in use.

In the figure, 17 is a ratio setting controller that controls the B component flow rate to the A component flow rate to a desired ratio;
The signal 18 from the flow meter 2 on the component line and the signal 19 from the flow meter 5 on the B component line are compared, and the signal 20 is applied to the flow rate control valve on the B component line so that the B component flow rate to the A component flow rate becomes the desired ratio. 6 to control the flow rate of the B component line. Reference numeral 21 denotes a pressure regulator, which outputs a signal from the pressure detection end 22 provided in the hesogoo tube 7 when the valve opening degree of the flow rate regulating valve 6 is below a certain upper limit, for example, 90% or below. Then, a signal 24 is sent to the pressure regulating valve 3 of the A component line so that the header pressure in the header pipe 7 becomes a constant standard pressure (for example, 2 kg/csa-G). The pressure regulator 21 also receives a signal 20 from the ratio setting controller 17, and when the valve opening of the flow rate regulating valve 6 exceeds a certain upper limit, for example 90%, as indicated by the signal 20, an alarm is issued and Cascade control is performed to lower the set pressure of the pressure regulator 21, and if the valve opening of the flow rate control valve 6 continues to exceed the upper limit, for example, PI operation (proportional integral operation)] or the limit of the valve opening. When the value exceeds, for example, 99%, the pressure regulating valve 3 is operated to be fully closed.

Since the header pressure needs to be above a certain limit in order to ship products from the mixed flow line, the pressure regulator 21 also measures the header pressure at a certain lower limit, e.g.
If the header pressure drops to 4 kg/c1a-G, an alarm will be issued to the workers on site at the shipping ports 9 to close one or more of the shipping ports 9, and the header pressure will further drop until it reaches a certain limit pressure, e.g. 1 kg/crlJ. -G, the pressure regulating valve 3 is fully closed and all shipping ports 9 are closed. Although it is not necessary to control the header pressure, it is preferable. As the ratio setting controller 17 and the pressure regulator 21, ordinary industrial instruments are sufficient, but a calculator or a computer may be used if necessary.

(effect) Next, the operation of the mixing device shown in FIG. 1 will be described.

When the amount used outside the system from pipes 15 and 16 is small (the primary pressure of the A component line and B component line is sufficiently high), or when the number of shipping ports 9 in use is small, the header pipe 7 Since the internal pressure is easily maintained at a standard pressure, for example, 2 kg/cJ·G, the flow rate of the B component to the A component flow rate is maintained at a desired ratio, and shipping operations can be performed normally. Even if the primary side pressure of the A component line and B component line becomes higher than this state, or the number of shipping ports in use decreases, the header pressure will be maintained at the predetermined standard pressure, and shipping operations will continue normally. be exposed. Also, the primary pressure of the A component line becomes extremely low compared to the primary pressure of the B component line, and as a result, the A component flow rate decreases, and the B component flow rate also decreases, so shipping operations will not proceed normally. It will be done. vice versa,
If the primary side pressure of the B component line becomes extremely low compared to the primary side pressure of the A component line, or if the number of shipping ports during shipping increases, the B component flow rate relative to the A component flow rate should be adjusted to the specified value. In order to maintain the ratio, the opening degree of the flow control valve 6 is increased to maintain shipping operations. Furthermore, when the opening degree of the flow rate control valve 6 exceeds the upper limit value, for example 90%, an alarm is issued to the workers at the shipping port 9 site to close one or more shipping ports 9, and the valve opening degree is adjusted accordingly. The set pressure of the pressure regulator 21 decreases, and the pressure regulating valve 3 of the A component line is throttled. Therefore, the flow rate of the A component decreases, and the ratio of the B component flow rate is controlled accordingly to maintain the shipping operation for the time being. Furthermore, if the valve opening degree of the flow rate regulating valve 6 continues to exceed the upper limit value or exceeds the limit value, the pressure regulating valve 3 is fully closed and all the shipping ports 9 are closed.

Further, even if the header pressure decreases and reaches a certain lower limit pressure, for example, 1°4 kg/Cl1t-G, an alarm is issued from the pressure controller 21. When the pressure reaches 1 kg/cni + G, the pressure regulating valve 3 is fully closed and all shipping ports 9 are out of use.

(Example) Using the mixing device shown in FIG. 1 (with five shipping ports 9), light oil was mixed as component A and kerosene as component B at a ratio of light oil to kerosene of 60:40. Primary side pressure of A component line and B component line is O15~10kg/cIa-G
Even if the number of shipping units in use varied from 1 to 5, a mixed flow of a predetermined ratio could be obtained with a mixing accuracy of 0.5% or less.

(Effects of the Invention) In the mixing device according to the present invention, even if the primary pressure or secondary pressure of each component line is randomly increased (varies), each component is mixed at a desired ratio, and the mixing accuracy is, for example, 0. .5%
This is very expensive and allows for multiple shipments. Furthermore, industrial instruments may be used as the control equipment (ratio setting controller or pressure regulator), and no human effort is required for control.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of a mixing device according to the present invention. 1-----One pipe, 2-----One flow meter, 3-----One pressure regulating valve, 4-----One tube, 5-----One flow meter, 6 --------First flow control valve, 7------header pipe, 9------1 shipping port, 17---1 ratio setting controller, 21-111・-pressure Controller.

Claims (1)

[Claims] In a mixing device for mixing two or more liquid components, a reference line, which is one line among multi-component lines and is equipped with a flow meter and a pressure regulating valve, and other component lines. A follow-up line is equipped with a flow meter and flow control valve, a ratio setting controller adjusts the flow rate of the follow-up line according to the flow rate of the reference line, and a ratio setting controller that controls the pressure adjustment valve of the reference line to control the flow rate of the reference line and the follow-up line. and when the signal issued from the ratio setting controller to the flow control valve of the follow-up line reaches an amount corresponding to the valve opening of a predetermined value or more, the set pressure of the mixed flow line is adjusted. A mixing device comprising: a pressure regulator that controls a reference line pressure regulating valve by lowering the pressure;